What is this ?

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Aceman21

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I bought a used skimmer an this is in the filter an I'm not sure what it is.
ImageUploadedByTapatalk1429296017.630521.jpg
 
It's a type of tubeworm but not feather dusters. Feather dusters don't grow in hard calcium based tubes. A just scrape them and they should come off
 
How do I prevent them from coming into my filter when I start my tank ? Are they harmful
 

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